| Title | National Traffic Speeds Survey I: 2007 |
|---|---|
| Record ID | 45877 |
| Personal Name Creator |
Huey, R.; De Leonardis, Doreen; Shapiro, G.; Freedman, M. |
| Corporate Creator | Westat, Inc. |
| Corporate Contributor |
United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research |
| Publisher | United States. National Highway Traffic Safety Administration |
| Publication Date | 20120800 |
| Language | English |
| Abstract | A field survey was conducted during spring and summer 2007 to measure travel speeds and prepare nationallyrepresentative speed estimates for all types of motor vehicles on freeways, arterial highways, and collector roads across the United States. Over 10 million vehicle speeds were measured at more than 700 sites included in the geographic cluster sample of 20 primary sampling units (PSUs). Each PSU was a city, county, or group of two or three counties representing combinations of regions of the United States, level of urbanization, and type of topography (flat, hilly, mountainous). Speeds were acquired on randomly drawn road segments on limited access highways, major and minor arterial roads, and collector roads. Speed measurement sites were selected in road segments with low, medium or high degrees of horizontal and vertical curvature or gradient. Overall, speeds of free-flow traffic on freeways averaged 64.7 mph and were approximately 11 mph higher than on major arterials, which at 53.6 mph were in turn about 7 mph higher than the mean speed of 46.9 mph on minor arterials and collector roads. Most traffic exceeded the speed limits. Nearly half of traffic on limited access roads and about 60% of traffic on arterials and collectors exceeded the speed limit. About 15% of traffic exceeded the speed limit by 10 mph or more on freeways, arterials and collector roads. Speeds of passenger vehicle size classes were generally higher than for medium trucks. Often, speeds of large trucks were higher than medium trucks, and in some circumstances, large truck speeds were higher than passenger vehicles. |
| Rosap ID | dot:1941 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/1941 |
| TRT Terms | Traffic regulations; Speed limits; Speeding; Driver errors; Human factors in crashes; Traffic safety |
| General Subjects | Speed-related crashes; Speed management; Driving speeds; Traffic safety; Speed measurement |
| Classification | NTL - SAFETY AND SECURITY - Speed Limits; NTL - SAFETY AND SECURITY - Human Factors |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1449580 |
| Contract Number | DTNH22-02-D-65121; TASK ORDER 6 |
| Report Number | DOT HS 811 663 |
| Availability | NHTSA - Behavioral Safety Research |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/45000/45800/45877/811663.pdf |
| Format | |
| Database | NTL Digital Repository |